When you look at an object, the image of that object
appears upside down on your retina. However, your brain
automatically corrects for this, allowing you to perceive
the object the right side up.
Enamel, found on our teeth, is the hardest substance in
the human body.
The soles of your feet contain more sweat glands and
more pressure-sensitive nerve endings per square inch
than any other part of your body.
Like fingerprints, every person has a unique tongue print.
The kidneys filter your blood up to 300 times per day.
During the first six weeks of life, there is no difference
between the male and female embryo.
Human fingers stretch and bend about 25 million times in
a normal lifetime.
The human body contains 30 000 billion red blood cells.
Nerve impulses to and from the brain travel as fast as
274
km per hour.
Fingernails grow nearly 4 times faster than toenails
medical
FUN FACTS
